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Retirement Plans and Other Postretirement Benefits - Fair Value of Plan Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 783,203 $ 774,329
U.S. Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 617,436 599,886
Municipal bonds | U.S. Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 1,456 1,253
Hedge Funds | U.S. Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 31,900 0
Corporate debt instruments | U.S. Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 2,595 5,295
Corporate debt instruments – Preferred | U.S. Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 18,027 16,004
Corporate stocks – Common | U.S. Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 56,258 43,287
Registered investment companies | U.S. Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 145,380 169,794
U.S. Government securities | U.S. Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 1,141 1,262
Total investments | U.S. Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 256,757 236,895
Investments measured at net asset value | U.S. Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 360,679 362,991
Level 1 | U.S. Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 201,638 213,081
Level 1 | Municipal bonds | U.S. Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Level 1 | Hedge Funds | U.S. Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Level 1 | Corporate debt instruments | U.S. Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Level 1 | Corporate debt instruments – Preferred | U.S. Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Level 1 | Corporate stocks – Common | U.S. Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 56,258 43,287
Level 1 | Registered investment companies | U.S. Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 145,380 169,794
Level 1 | U.S. Government securities | U.S. Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Level 1 | Total investments | U.S. Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 201,638 213,081
Level 1 | Investments measured at net asset value | U.S. Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Level 2 | U.S. Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 23,219 23,814
Level 2 | Municipal bonds | U.S. Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 1,456 1,253
Level 2 | Hedge Funds | U.S. Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Level 2 | Corporate debt instruments | U.S. Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 2,595 5,295
Level 2 | Corporate debt instruments – Preferred | U.S. Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 18,027 16,004
Level 2 | Corporate stocks – Common | U.S. Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Level 2 | Registered investment companies | U.S. Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Level 2 | U.S. Government securities | U.S. Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 1,141 1,262
Level 2 | Total investments | U.S. Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 23,219 23,814
Level 2 | Investments measured at net asset value | U.S. Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 $ 0
Level 3 | U.S. Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 31,900  
Level 3 | Municipal bonds | U.S. Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0  
Level 3 | Hedge Funds | U.S. Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 31,900  
Level 3 | Corporate debt instruments | U.S. Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0  
Level 3 | Corporate debt instruments – Preferred | U.S. Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0  
Level 3 | Corporate stocks – Common | U.S. Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0  
Level 3 | Registered investment companies | U.S. Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0  
Level 3 | U.S. Government securities | U.S. Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0  
Level 3 | Total investments | U.S. Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 31,900  
Level 3 | Investments measured at net asset value | U.S. Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 0